Add pagification vit gitlab ci

.gitlab-ci.yml

+image: node
+
+before_script:
+  - npm install
+
+cache:
+  paths:
+    - node_modules/
+
+pages:
+  script:
+    - "node index.js > index.html"
+    - "mkdir public"
+    - "mv index.html sorttable.js public/"
+  artifacts:
+    paths:
+      - public
+  only:
+    - master
+